Few museum specimens of the isolated Atlantic F. Some ornithologists have questioned the validity of these subspecies as they appeared to differ only in their size. It has disappeared as a breeding bird from the main island, but very small numbers (less than 40 breeding pairs) remain on a small offshore islet. It occurs in the South Atlantic off the coast of Brazil and breeds on the Trindade Archipelago. trinitatis was named by the Brazilian zoologist Alípio de Miranda-Ribeiro in 1919. It occurs in the western Indian Ocean and breeds on the Aldabra atoll. iredalei named by the Australian ornithologist Gregory Mathews in 1914. ariel occurs in the central and eastern Indian Ocean, the seas off South East Asian and from northern Australia to the west and central Pacific Ocean. The genus is the only member of the family Fregatidae. The other four are: the great frigatebird ( Fregata minor), the Christmas frigatebird ( Frigata andrewsi), the magnificent frigatebird ( Fregata magnificens) and the Ascension frigatebird ( Fregata aquila). The lesser frigatebird is one of five closely related species of the genus Fregata. The lesser frigatebird was first described as Atagen ariel by the English zoologist George Gray in 1845 from a specimen collected on Raine Island, Queensland, Australia. Frigatebirds feed on fish taken in flight from the ocean's surface (often flying fish), and sometimes indulge in kleptoparasitism, harassing other birds to force them to regurgitate their food. The female is slightly larger than the male and has a white breast and belly. The male has a striking red gular sac which he inflates to attract a mate. The lesser frigatebird is a lightly built seabird with brownish-black plumage, long narrow wings and a deeply forked tail. It occurs over tropical and subtropical waters across the Indian and Pacific Oceans as well as off the Atlantic coast of Brazil. At around 75 cm (30 in) in length, it is the smallest species of frigatebird. The lesser frigatebird ( Fregata ariel) is a seabird of the frigatebird family Fregatidae.
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